54 results about "Truss bridge" patented technology

The invention relates to the technical field of concrete paving, in particular to a steel truss bridge surface ultrahigh toughness concrete automatic dispersing and paving device and a construction method.The device comprises a mounting shell assembly, a concrete dispersing mechanism is mounted at the upper end of the mounting shell assembly, and a paving range regulating and controlling mechanism is arranged in the mounting shell assembly; the paving range regulating and controlling mechanism is arranged at the lower end of the concrete dispersing mechanism; the method comprises the following steps of traction installation, concrete dispersion, preliminary adjustment of output width, preliminary adjustment of paving thickness, high-frequency vibration and power output. According to the device, full dispersion operation can be carried out on ultrahigh-toughness concrete, dispersion uniformity is guaranteed, targeted adjustment can be carried out according to the paving width and thickness, and plane vibration leveling operation is carried out on the surface of the ultrahigh-toughness concrete after paving is completed; the dispersion uniformity and the paving quality of the ultrahigh-toughness concrete are further ensured.

The invention relates to the technical field of bolt looseness monitoring, in particular to a visual monitoring and early warning method and system for looseness of a high-strength bolt of a steel truss bridge, and the method comprises the steps: obtaining a bolt gray image and a reference gray image of the high-strength bolt on the steel truss bridge; strong edge points and weak edge points are obtained, and the strong edge points are clustered; calculating the linearity of each strong edge point, and screening and rejecting the strong edge points in the cluster; determining a first evaluation value and a second evaluation value of each weak edge point, adjusting a high threshold in a dual-threshold edge detection algorithm, re-dividing the weak edge points and strong edge points in a cluster, and extracting an edge line in the bolt grayscale image; acquiring a matched edge line of each edge line in the bolt grayscale image; and obtaining a loosening coefficient of the bolt gray level image, and monitoring and early warning the loosening state of the high-strength bolt. According to the invention, the monitoring accuracy of the loosening state of the high-strength bolt is improved.

The application relates to a steel truss bridge thick plate residual stress detection and repair integrated construction device, and belongs to the technical field of weld detection, which comprises a frame body, a drilling device, a strain gauge and a strain acquisition and analysis instrument are arranged on the frame body, a bearing disc is arranged on the frame body, the bearing disc slides along the vertical direction relative to the frame body, meanwhile, the bearing disc is also rotationally connected with the frame body, and the bearing disc rotates relative to the frame body; a polishing disc and a filler box are further arranged on the frame body, the polishing disc, the filler box and the drilling device are all located below the bearing disc, the polishing disc is rotationally connected with the bearing disc and rotates relative to the bearing disc; the filler box and the drilling device are fixedly connected with the bearing disc, the filler box is filled with metal filler, and a feeding pipe group for conveying the metal filler from the filler box to the outside is connected to the filler box, the application has the effect of timely plugging the residual small holes after the residual stress of the steel is detected, and the effect of repairing the steel is achieved.

This invention relates to the field of bridge health monitoring, providing a method and system for identifying local buckling of steel truss bridge members. The method includes: acquiring continuous dynamic strain, local rotation angle, and visual observation data; obtaining the original monitoring data set through spatiotemporal coordinate normalization and dimensional rearrangement; extracting dynamic curvature features, combining local rotation angle data to obtain boundary correction curvature, and extracting buckling candidate groups in conjunction with visual observation data; constructing a training label set based on the buckling candidate groups, simulation parameter set, and visual observation data; constructing buckling precursor features using boundary correction curvature and buckling candidate groups to generate a buckling identification network; extracting non-equilibrium decoupling features to generate an adaptive decoupling parameter set, constructing an updated feature tensor based on the boundary correction curvature, and outputting engineering early warning results based on the buckling identification network. This invention integrates multi-source heterogeneous spatiotemporal data and physically consistent mechanical constraints to construct a closed-loop mechanism for local buckling decoupling identification and adaptive early warning of steel truss bridge members.

The application relates to a large-span long-connection highway-railway combined continuous steel truss beam large-tonnage support post-installation construction method, which comprises the following steps: installing temporary supports; erecting a steel truss beam and a highway bridge deck; respectively lifting the steel beams at the top of each pier, constructing a wet joint in the negative bending moment area of the top of the pier, tensioning horizontal and vertical prestress, lowering the beam, and folding each steel truss beam to install the steel truss beams into an integrated continuous steel truss beam; installing a slide corresponding to the position of the middle truss of the steel truss bridge, lifting the integrated continuous steel truss beam; removing the temporary supports, installing formal supports, and pouring grouting into the formal supports; curing the completed formal supports, and lowering the integrated continuous steel truss beam onto the formal supports after the curing is completed. According to the application, the temporary supports are first installed, then the steel truss beams are assembled, and finally the steel truss beams are lifted and assembled; the formal supports are installed through the slide, the technical problem of the difficulty in installing the formal supports in a narrow construction space is effectively solved, and the installation precision and quality of the formal supports are ensured.

The utility model discloses a sewage treatment settling pond which comprises a sewage settling pond, a sewage discharge pipe is arranged at the bottom end of the sewage settling pond, a truss bridge is arranged at the top end of the sewage discharge pipe, a central operation table is arranged in the middle of the truss bridge, and a high-power asynchronous motor is arranged at the center of the central operation table. The truss bridge is mounted on the sewage sedimentation tank, and the high-power asynchronous motor is mounted in the middle of the truss bridge, so that the high-power asynchronous motor can drive the rotary column to rotate, and the cross beam at the bottom end of the rotary column drives the two groups of scrapers to rotate along the bottom of the sewage sedimentation tank; the sludge at the bottom of the sewage sedimentation tank is scraped by the two groups of scrapers in the rotating process, so that the sludge outside the two groups of scrapers gradually gets close to the middle of the bottom end of the sewage sedimentation tank and is discharged outwards along the blow-off pipe, the sludge at the bottom of the sewage sedimentation tank can be effectively cleaned, and the cleaning difficulty of the sludge is reduced.

The invention relates to the technical field of pre-tightening force detection, in particular to an automatic detection method and system for the pre-tightening force of a high-strength bolt group of a steel truss bridge, and the method comprises the steps: screening out a bolt connected domain from an image of each connection node; the difference of impedance signals between each bolt connected domain and other bolt connected domains is analyzed, and the discrete degree of texture feature values of all edge pixel points in each bolt connected domain and the difference between the maximum value of the impedance signal of each bolt connected domain and the maximum value of all impedance signals at the corresponding connection node are combined. Screening out a suspected abnormal connected domain according to the shape feature value and the shape feature value; and determining a bolt replacement coefficient of each connection node so as to detect the pre-tightening force of the high-strength bolt group at each connection node. According to the invention, the external deformation and internal loosening conditions of the bolt are comprehensively considered, so that the detection precision of the pretightening force of the high-strength bolt on the steel truss bridge is improved.

This invention relates to the field of steel truss bridge installation technology, and proposes a steel truss bridge construction and installation system for installing steel trusses onto bridge piers. The system includes hoisting equipment, temporary supports, a movable lifting support, a movable adjustment frame, and a limiting bracket. Two rows of bridge piers are constructed across a river, with multiple temporary supports spaced apart between two piers in the same row. A movable lifting support is positioned between the two rows of temporary supports, and its lifting is achieved through a scissor mechanism. Several movable adjustment frames are movably mounted on both sides of the upper end of the movable lifting support. A limiting bracket is located on the upper end of the temporary supports, away from the movable lifting support, and moves up and down through a limiting plate to abut against the steel truss. This invention achieves rapid positioning through the movable lifting support, movable adjustment frame, temporary supports, and limiting bracket, simplifying the positioning operation and improving construction efficiency.

The application is a construction method of long-line multi-connected steel truss bridge, comprising the following steps: erecting steel truss assembling support on the first bridge pier side of the long-line steel truss bridge; using crawler crane to assemble the first group of steel truss segments above the steel truss assembling support of the first bridge pier side; immediately paving the lower railway bridge deck after assembling one steel truss segment; setting temporary supporting pads on the top of the second bridge pier on the left side and the third bridge pier on the right side, taking the first bridge pier as the starting point; respectively installing the second group of steel truss segments to the two sides with the first group of steel truss segments as the center; continuing to assemble the next group of steel truss segments to the two sides until the whole long-line steel truss bridge is erected. The application combines the paving sequence of the bridge deck in the longitudinal and transverse directions with the erection and falling sequence of the steel truss, effectively controlling the cracks of the concrete bridge deck.

This application relates to the field of bridge technology, and in particular to a double-layer steel truss bridge structure, comprising an upper bridge, a lower bridge, and two supporting columns erected between the upper and lower bridges. The lower bridge is supported on a lower crossbeam, and the upper bridge is supported on an upper crossbeam. The two supporting columns are erected on the lower bridge, with their tops supporting the bottom of the upper bridge. A connecting truss is provided between the two supporting columns, with its left and right ends connected to the two supporting columns, respectively. The purpose of this application is to effectively solve the problem of poor support stability of the upper bridge structure in a double-layer bridge structure.

The application relates to the field of steel truss bridges, and discloses a sectional steel truss bridge which comprises multiple trusses, each of the trusses comprises a road surface plate and two side support frames, one side of each of the side support frames is hinged with multiple support cross beams, the multiple support cross beams connected to the same side support frame are arranged at intervals along the length direction of the side support frame, an adjusting mechanism is arranged on each of the side support frames, the multiple support cross beams located on the same side support frame are connected with the adjusting mechanism corresponding to the side support frame, the adjusting mechanism is used for driving the multiple support cross beams to rotate, and the road surface plate is connected to the multiple support cross beams. The application has the effects of improving the speed of construction personnel in splicing the steel truss bridge on the construction site and improving the installation efficiency of the steel truss bridge on the construction site.

The invention relates to the technical field of bridges, in particular to a temporary pipe support stable assembly type truss structure bridge and a mounting method thereof. Comprising a bridge floor which is transversely arranged on a plurality of bridge pier supports; the trusses are arranged on the two sides of the bridge floor in the width direction, each truss is formed by fixing a plurality of steel truss sections, and each truss comprises a truss upper chord and a truss lower chord; and the bridge portal frames are longitudinally arranged on the two sides of the bridge floor in the length direction and fixed to the two trusses. The truss is formed by fixing a plurality of steel truss sections, and in the process that the steel truss sections are assembled one by one on a construction site, accurate positioning and stable assembly of the Golomery steel truss sections are achieved in a temporary pipe support stable assembly mode; the problems that transportation is inconvenient and construction flexibility is low due to the fact that the whole truss is directly installed and assembled are solved, follow-up multiple times of matching, adjusting and installing are not needed, the construction and installing period is shortened, input cost is reduced, construction safety is improved, and potential safety hazards are avoided.

The invention discloses an in-service steel structural member stress in-situ detection method based on a structural axial force equivalent stiffness principle. The method comprises the following steps: firstly, determining a to-be-measured rod piece and a support form of the to-be-measured rod piece, and recording the deflection increment of the rod piece under load application by installing displacement measuring devices at the two ends and the middle position of the rod piece; calculating to obtain the rotational rigidity of the end part of the rod piece, and then calculating to obtain the flexural rigidity of the rod piece according to the load applied by the measuring point and the obtained displacement; and finally, based on an equation obtained by the relation between the flexural rigidity of the axial force equivalent negative rigidity and the axial force, calculating to obtain the axial force and the section stress borne by the rod piece. According to the invention, the stress state of the in-service steel structure rod member mainly based on axial force can be directly detected, and an initial state result does not need to be used for difference; the method can greatly simplify the stress state of the in-service structure and evaluate the safety of the in-service structure, and can be widely applied to stress state detection of in-service steel truss bridges, space trusses, large trusses and other members taking axial force as main rods.

The utility model provides a simple angle steel truss beam -like bridge support device relates to the field of building construction technique, including the masonry wall, the surface of masonry wall is equipped with the opening, the surface of masonry wall and be located the opening top is equipped with the embedded hole, the both sides inner wall of opening and be close to top all are equipped with the embedded groove, the inside of opening and embedded groove inserts has the upper angle steel and lower angle steel respectively, the top between upper angle steel and lower angle steel bottom between all equal interval welding has the inlay board. In the utility model, the temporary support setting procedure is saved, the construction process is simplified, the construction preparation workload is reduced, the construction time is shortened, the masonry in angle steel truss is reserved, need not new pouring concrete, reduces concrete, form and other material use, reduces the cost, also fits the green construction concept, avoids the concrete maintenance period, and the construction procedure is more compact, significantly improves the construction progress, helps the project fast advance.

The utility model provides a kind of connecting device for steel truss bridge, including flat plate connecting piece (1), the flat plate connecting piece (1) is fixedly installed in steel truss bridge beam top position to be connected by fastener (2);Its characterized in that: the inside of the flat plate connecting piece (1) is fixed with reinforcing component (3), the installation position of fastener (2) is additionally provided with protection component (4) in the inside of the flat plate connecting piece (1);By setting reinforcing component, the compression strength of flat plate connecting piece can be increased, the possibility that it is deformed and fractured by greater compression is reduced, the overall strength of flat plate connecting piece is guaranteed, its connection stability is improved, and its service life is prolonged;By setting protection component, protection component is sleeved on the periphery of fastener, so as to intercept rainwater and the like from outside, guarantee the connection effect stability of fastener, prolong its service life.

The utility model relates to the field of steel frame bridge equipment, and particularly discloses a steel frame bridge stacking and fixing device which comprises a storage rack, the storage rack comprises side plates, a back plate, a bottom plate and a top plate, a sliding groove is formed in the bottom plate, a pulley is arranged in the sliding groove, limiting grooves are formed in the left side and the right side of the sliding groove, limiting rods are symmetrically arranged on the two sides of the pulley, and a beret piece placing seat is arranged at the top of the pulley. The back plate is connected with the rotating rod, the torsion spring and the positioning block are arranged on the periphery of the rotating rod, the round hole is formed in the joint of the side plate and the bottom plate, one end of the rotating rod is located in the round hole, and the purpose of quick assembly and disassembly can be achieved by placing beret pieces in the beret piece placing base and the beret piece sliding groove. Collision between the beret pieces can be effectively reduced, and an anti-rust coating on the beret pieces is prevented from being damaged due to collision.

The invention relates to the technical field of steel truss bridge deck manufacturing, in particular to a ballastless track steel truss bridge deck manufacturing process. A railway bridge deck is formed by continuously matching and splicing multiple sections and is manufactured by adopting a reverse manufacturing method in a matching manner. According to the method, the raw material plates entering a factory are leveled in the manufacturing process, the flatness per square meter is not larger than 1 mm, therefore, residual deformation of the steel plates is eliminated, rolling internal stress is reduced, deformation in the manufacturing process can be reduced, and the unstressed length of the steel plates is guaranteed. Pre-camber offset is set for the standard node cross beam and the fulcrum cross beam, so that the steel beam can smoothly reach a designed line shape in a stressed mounting state; a reverse manufacturing method is adopted for matched manufacturing, and a multi-section continuous matching and splicing method is adopted for installation, so that stress and deformation in the installation process are reduced, and it is guaranteed that actual installation is conducted smoothly.

This invention discloses a three-dimensional assembly method for ultra-large span double-layer steel truss bridges, including: setting two rows of steel piers according to the camber of the jig and preventing settlement; using a gantry crane with special clamps to achieve the horizontal and vertical conversion of the truss segments; assembling the first segment in the order of lower bridge deck, side trusses, and upper bridge deck; subsequently, matching and welding the mother segments in the same order; pre-setting vertical anti-deformation during assembly, and welding from the middle section to both sides; uniformly installing anchor pipes after the completion of the large segment assembly in a single round; setting three quality control points during assembly to check the total length, side curvature, truss width, diagonal difference, camber, and anchor point spacing; after passing the test, disassembling and removing the jig, retaining the mother segment for the next round. This application controls welding deformation and cumulative alignment error through multi-segment continuous matching assembly and anti-deformation pre-setting; the subsequent installation of anchor pipes avoids collisions and ensures anchor point accuracy; setting the jig according to the camber and re-measuring in rounds achieves a reliable transition from stress-free to stress-loaded installation.

A method for constructing steel truss bridges without scaffolding is disclosed. This method involves erecting a ground-based assembly jig on the construction site. Each segment of the steel truss bridge is transported from the processing plant to the construction site, where it is welded, riveted, and assembled using the ground-based jig. After assembly on the ground, the steel truss bridge is erected on the piers using a double-crane lifting method. This method eliminates the need for traditional high-altitude support structures, significantly reducing construction time and costs while greatly improving safety. Furthermore, the ground-based bolting and welding of the steel truss bridge segments facilitates measurement and adjustment of the bridge's assembly linearity, reducing construction difficulty and significantly improving efficiency and quality.

The invention provides a large-span steel truss girder bridge energy dissipation connecting structure and a construction method, and belongs to the technical field of steel truss girder bridges, the large-span steel truss girder bridge energy dissipation connecting structure structurally comprises steel truss girder structures, every two adjacent steel truss girder structures are connected end to end in a sleeved mode and are permanently and obliquely pulled and fixed through a plurality of slings, and each steel truss girder structure comprises a steel truss girder body. A first sleeving chamber and a second sleeving chamber are formed in the left side face and the right side face of the steel truss girder body respectively, a plurality of buffering sleeve head structures are fixedly installed in the first sleeving chamber in the longitudinal direction at intervals, and a plurality of buffering sleeve seat structures used for being in aligned sleeving connection with the buffering sleeve head structures are fixedly installed in the second sleeving chamber in the longitudinal direction at intervals. The adjacent steel truss girder main bodies can longitudinally slide and slightly rotate for buffering and damping, and the multiple sections of steel truss girders are adopted to independently swing and buffer and dissipate energy, so that structural deformation or damage of the steel truss girders caused by overall swing of the large-span steel truss bridge is prevented.

The application relates to the technical field of bridge engineering, and discloses a bridge fixing structure for a steel structure truss arch bridge, which comprises a bridge deck, a truss bridge, a truss tail beam and a fixing ring, a mounting part is arranged below the bridge deck and is used for mounting butt joint tools and compensation tools, a butt joint part is arranged on the mounting part and is used for adaptively adjusting the balance degree of the truss bridge and the truss tail beam, a compensation part is arranged on the mounting part, an automatic emergency compensation mechanism is adopted, the bridge inclination offset can be automatically compensated, pressure sensors on the top of both sides of an underlying pressure bearing plate can monitor the pressure in real time, once the bridge inclines and deviates due to various loads, the pressure sensors can rapidly capture the pressure change, when the pressure difference exceeds a set threshold value, the compensation program is triggered immediately, a signal is sent to a hydraulic rod, the hydraulic rod acts to push a compensation column, the compensation column drives a regulating arm to rotate, simultaneously, the steel cable is pulled to generate tension, and then the offset of the truss bridge is corrected, so that the bridge structure can be quickly restored to stability.

The application discloses a virtual pre-assembly method for a steel truss bridge based on a laser point cloud scanning technology, and comprises the following steps: obtaining point cloud data of a prefabricated steel truss bridge component through a laser point cloud scanning module, modeling, obtaining an initial steel truss bridge component model, comparing the steel truss bridge component model data with corresponding standard component model data set in a distributed data node module, obtaining errors of the steel truss bridge component model and the corresponding standard component model, if the errors are within a set error range, the steel truss bridge component model is qualified, the qualified steel truss bridge component model is sent to a corresponding assembly module in a cloud virtual assembly server through the distributed data node, the assembly module assembles according to a component assembly sequence, a steel truss bridge model is obtained, if the error between the obtained steel truss bridge and a standard steel truss bridge model is within a set error range, the assembly is completed.

The invention provides a beam cable beam anchoring structure of a steel truss beam cable-stayed bridge. The beam cable beam anchoring structure aims at improving the bearing capacity of the structure, improving stress distribution and simplifying the construction process. The bidirectional curve gradual transition and gradual thickening design is adopted in the connecting area of the overall anchoring plate and the main truss gusset plate, and the root bearing strength is enhanced; a pressure-bearing structure in the steel anchor box is optimized from a # shape to a radiation type layout, and radial stiffening plates are arranged, so that uniform transmission of cable force is realized, and stress concentration is reduced; the joint of the anchor pulling plate and the gusset plate adopts a large-radius convex arc and concave curve combined model, and a smooth force flow channel is provided; a positioning clamping structure is arranged at the bottom end of the anchoring plate and connected with the main truss gusset plate, rapid positioning and suspension are achieved, the installation precision is ensured, a double force transmission mechanism with welding as a main part and clamping as an auxiliary part is formed, and the structural safety and the construction efficiency are improved. The structure has the advantages of being reasonable in stress, convenient to construct, long in service life and the like.

This invention provides a towing construction process for a double-layer steel truss bridge with sequentially connected double-layer cast-in-place box girders. The steps are as follows: construct the bridge's pile foundations and abutments, construct the piers, erect assembly supports, hoist the guide beam, and assemble the steel truss section; first, hoist the guide beam and the assembled steel truss section, then perform the first towing; after completion, hoist the remaining sections for subsequent towing construction; after the first towing is completed, construct the unaffected cast-in-place box girder section on the left; after the steel truss reaches the assembly supports above the fourth pier, the guide beam can be removed, and the unaffected cast-in-place box girder section on the right can be constructed; after the overall towing is completed, construct the upper piers, construct the auxiliary structures, and dismantle the assembly supports. This overcomes the limitations of existing technologies where the steel truss cannot be installed on the piers at the junction of the truss section and the cast-in-place box girder section. Furthermore, by constructing the cast-in-place box girder during the towing and assembly process, the construction period is significantly shortened, and traffic control time is reduced.

The application relates to a reinforcing device for pushing construction of a large-span steel truss bridge, which comprises a bridge pier and a plurality of steel columns arranged outside the bridge pier, and further comprises a plurality of annular connecting plates and an annular driving plate, the annular connecting plates are slidably sleeved outside the plurality of steel columns, the annular connecting plates are provided with fixing assemblies and connecting assemblies, the fixing assemblies are used for fixing the annular connecting plates to the steel columns, and the connecting assemblies are used for fixing the annular connecting plates to the bridge pier; the annular driving plate is slidably sleeved on the plurality of steel columns and located below the plurality of annular connecting plates, and the annular driving plate is provided with a driving assembly used for driving the annular driving plate to move along the steel columns. The application has the effect of improving construction efficiency.

The application discloses a linear control and deviation rectification method for steel truss bridge scattered assembly construction, and relates to the technical field of bridge construction. The method realizes linear control and deviation rectification through stage measurement and welding. First, beam segment rough positioning and temporary fixing are performed, then main truss axial deviation, vertical deviation and vice truss shape position are controlled in three steps, each step is guided by measurement data to guide welding and retest, and positioning is supplemented by locking effect of a board. After that, high-strength bolts are used to replace punch nails, cross beams are installed in sequence and welding is completed, and finally crane constraints are released. The method ensures assembly accuracy through the cycle of "measurement, calculation, welding and retest". The application can provide data support for scattered assembly construction control of steel truss bridge in engineering by real-time guiding welding operation through measured data, and solves the problems of poor adaptability and insufficient precision of traditional methods.

The invention discloses a linear control and deviation correction method for scattered splicing construction of a steel truss girder bridge, and relates to the technical field of bridge construction. According to the method, linear control and deviation correction are achieved through staged measurement and welding. Firstly, coarse positioning and temporary fixing of a beam section are carried out, then axial deviation and vertical deviation of a main truss and the shape and position of an auxiliary truss are controlled in three steps, welding is guided through measurement data in each step, remeasurement is carried out, and the locking effect of a positioning horse plate is assisted. And then replacing the punching nails with high-strength bolts, installing the cross beams in sequence and completing welding, and finally releasing the constraint of the crane. According to the method, the assembly precision is ensured through circulation of measurement, calculation, welding and remeasurement. Welding operation is guided in real time through measured data, the problems that a traditional method is poor in adaptability and insufficient in precision are solved, and data support can be provided for scattered splicing construction control of the steel truss girder bridge in engineering.

This invention relates to the field of steel truss bridge deck fabrication technology, and particularly to a fabrication process for ballastless track steel truss bridge decks. The railway bridge deck is assembled using a multi-segment continuous matching method and manufactured using a reverse-engineering method. In this invention, the raw material plates are leveled before preparation to achieve a flatness of no more than 1mm per square meter, thereby eliminating residual deformation and reducing rolling internal stress, thus minimizing deformation during manufacturing and ensuring stress-free length. Furthermore, a pre-camber offset is set for the standard node crossbeams and support crossbeams to ensure that the steel beams can smoothly achieve the designed alignment under stress during installation. The reverse-engineering method and multi-segment continuous matching assembly method are used for manufacturing to reduce stress and deformation during installation, ensuring smooth actual installation.

The application discloses a curved stiffening chord steel truss bridge design method and a steel truss bridge, and relates to the technical field of bridge design.The method comprises the following steps: in a vertical plane, a part of the upper chord rod system line corresponding to the stiffening chord system line is translated upwards by a set length to serve as a stiffening chord plane rotation shaft; the vertical plane is rotated by a set angle along the stiffening chord plane rotation shaft to the bridge deck side to serve as a stiffening chord plane; the stiffening chord system line is established in the stiffening chord plane, and the stiffening chord structure is established based on the stiffening chord system line.The established stiffening chord structure has no transverse deviation when being spliced with the upper chord rod, and has no secondary stress, and can adapt to different proportional longitudinal slopes on both sides of a circular curve.The method solves the problem that the existing technology brings certain splicing secondary stress to the structure when the stiffening chord is spliced, and threatens the safety of the structure.

The invention discloses a large-span steel truss bridge cantilever pushing and traction device in a mountain and valley narrow area, and relates to the technical field of pushing and traction devices, the large-span steel truss bridge cantilever pushing and traction device comprises a leveling assembly, a pushing counter-force seat, a controller and a centering assembly, the bottom of the leveling assembly is fixedly connected with the top of the centering assembly, and the leveling assembly comprises a bottom plate. In the scheme, five electric push rods are started to drive five first rotating blocks to rotate on five fixing shafts and five second rotating blocks to rotate on connecting rods, so that a placing plate and connecting columns can be driven to rotate along the fixing rods, and the placing plate can be horizontally adjusted until the placing plate and the steel truss segment are in a horizontal state; according to the steel truss section pushing and pulling device, the levelness and stability during pushing and pulling are guaranteed, the follow-up pushing and pulling efficiency of the steel truss section is improved, then three hydraulic cylinders are started through a controller, and under the action of two side columns, two strip-shaped grooves and two strip-shaped sliding blocks, the three hydraulic cylinders drive a containing plate and the steel truss section to be pushed forwards.